Profits Tax and
Property Tax are chargeable on a person's income from business and let-out
premises respectively. In general, it is advisable for the low-income
earners of such incomes to elect for Personal Assessment because they can
benefit from the deductions or allowances that are not available under
Profits Tax and Property Tax.

Then, the tax payable
is computed at the sliding rates or standard rate under Salaries Tax on the reduced total income.
In other words, to compute the tax, just substitute the net assessable
income under Salaries Tax by the total reduced income (that is before
deduction of personal allowances) under Personal Assessment.